The principle is simple and powerful enough to be Marvin's Fourth Great Secret: If what they've been doing hasn't solved the problem, tell them to do… - Gerald Weinberg

We were doing incremental development as early as 1957, in Los Angeles, under the direction of Bernie Dimsdale [at IBM's ServiceBureau Corporation]. He was a colleague of John von Neumann, so perhaps he learned it there, or assumed it as totally natural. I do remember Herb Jacobs (primarily, though we all participated) developing a large simulation for Motorola, where the technique used was, as far as I can tell, indistinguishable from XP.

A controller that cannot control itself is worse than no controller at all: If you cannot manage yourself, you have no business managing others.

Science is the study of those things that can be reduced to the study of other things.